This is one of the last fully original stories completed by the great Tezuka Osamu (Tetsuwan Atom, Black Jack  you know  the father of modern manga/animation) before his death (his next project, Ludwig B, was unfinished as was his attempt to retell the new testament  although he did go back and add a couple of volumes to older works like Vampire and Hi no Tori).

Prime Rose is the story of a young princess/gladiator named Emiya who spurns the advances of the young emperor (much to the fury of her father) and through a series of adventures discovers that the Emperor is corrupt and vows his overthrow using the unusual ability that she discovers after an encounter with a seemingly homeless old man